There's supposed to be a drain plug on the block, but darned if I remember if I used it...
Might be a bit of a hijack, but I've got to adjust my valves in the next few weeks, going to pull the radiator, empty all coolant, replace with that Liquid Performance stuff.
If I pull the lower hose off the radiator on the left side of bike and let the radiator drain, and what's in that hose drain, is that about as empty as you can get the coolant system? Or is there something else needed to get it all out? I'm not sure how much would be left inside the block/water pump?
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There is a coolant drain plug to get the coolant that is not in the radiator or reservoir. I have modified my maintenance schedule so that I replace the coolant with my valve check. The amount of time works out for me with the mileage that I do.